Advantage flea control for cats and dogs is a topical parasiticide that effectively kills fleas on kittens and puppies 8 weeks and older. Advantage will control fleas on your pet within one day of treatment and will continue to protect your pet from further flea infestation for up to four weeks. Advantage kills the fleas before eggs are laid, and destroys re-infesting fleas within two. Advantage is an over the counter medication so no prescription is needed.